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Forum: Geometry
Re: Question Possibilities of simulating dynamic targets (Debasish Datta)
Date: 27 Jun, 2014
From: Marc Verderi <Marc Verderi>

Dear Debasish,

     By design, Geant4 does not simulate this sort of problem: materials 
are assumed to remain unaffected in the simulation by the passage of 
particles, whatever huge number of particles is shoot.
     But it might be that some workaround could be found to partly 
respond to your specific problem: could you tell more on your simulation 
needs to see if an "ad hoc" approach is possible ?


On 06/27/2014 12:04 PM, Debasish Datta wrote:
> *** Discussion title: Geometry
> Initially I have posted my question in 'Physics List' forum but after
> Andrea's feedback and suggestion I am reposting it again here in
> 'Geometry'. The original question was:
> Dear all,
> I am quite a novice user of GEANT4 and trying to simulate the effect of
> energetic ion (with keV - MeV energy) impact on metal nanoparticles. In
> such cases, it is an well known fact that some atoms of the target
> materials (here, the nanoparticles) will be sputtered out and the target
> will get eroded. So my question is, can it be possible to incorporate
> the effect of such erosion and subsequent target modification in the
> GEANT simulation? In other words, I need to change the target
> composition and geometry slightly after each ion impact. Can I do that?
> Thanking in anticipation.
> Debasish
> --
> And here was answer by Andrea Dotti :
> Hello,
> this is more a question related to geometry than physics. I suggest you
> to follow the geometry related forum. Can you please re-post your
> question (and my answer here) there?
> In G4 it is possible to simulate "moving" geometry. In your specific
> case mass/shape change. There are two techniques for that: 1- You are
> free to modify geometry between runs. You can simulate a short run with
> few particles, modify the geometry do a second run and so on 2- Use
> parametrized volumes to recompute geometry based on event number.
> Both techniques are covered in our tutorials in the advanced techniques
> for geometry. For example the most recent SLAC one covers the subject
> here:
> Regards, Andrea
> --
> After getting his feedback, now I want to add another question:
> In short...Is it possible to define the crystal structure (like Cubic,
> Face-centered cubic etc.) of the targets in Geant4?
> regards
> Debasish
> -------------------------------------------------------------
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